How many dB penalize listening from SD2SNES?

Hello...

As all we know, listening a tracklist from the emulator is louder than since the SD2SNES, but, the question is, How much is the difference in dB?, How much it penalizes?.

Thank you.

I usually have to set my Rev. F to +9db (it says +12 in most readmes but, +9 is fine) for it to equate to emulator loudness.

Yeah, I usually suggest +12dB, but I agree anywhere from 9-12 sounds good, at that point it mostly comes down to taste. I don't think anybody has really pinpointed it exactly, especially now that ikari has found and fixed the exact root cause with the Rev. H hardware.